Hydraulics And Fluid Mechanics Set 2

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This set of Hydraulics and Fluid Mechanics Multiple Choice Questions & Answers (MCQs) focuses on Hydraulics And Fluid Mechanics Set 2

Q1 | An object having 10 kg mass weighs 9.81 kg on a spring balance. The value of 'g' at this place is
  • 10 m/sec²
  • 9.81 m/sec²
  • 9.75 m/sec²
  • 9 m/sec
Q2 | A flow is called hyper-sonic, if the Mach number is
  • Less than unity
  • Unity
  • Between 1 and 6
  • None of these
Q3 | Liquids
  • Cannot be compressed
  • Occupy definite volume
  • Are not affected by change in pressure and temperature
  • None of the above
Q4 | When a cylindrical vessel containing liquid is resolved, the surface of the liquid takes the shape of
  • A triangle
  • A paraboloid
  • An ellipse
  • None of these
Q5 | Fluid is a substance that
  • Cannot be subjected to shear forces
  • Always expands until it fills any container
  • Has the same shear stress at a point regardless of its motion
  • Cannot remain at rest under action of any shear force
Q6 | The force exerted by a moving fluid on an immersed body is directly proportional to the rate of change of momentum due to the presence of the body. This statement is called
  • Newton's law of motion
  • Newton's law of cooling
  • Newton's law of viscosity
  • Newton's law of resistance
Q7 | The property of a fluid which enables it to resist tensile stress is known as
  • Compressibility
  • Surface tension
  • Cohesion
  • Adhesion
Q8 | The loss of pressure head in case of laminar flow is proportional to
  • Velocity
  • (Velocity)2
  • (Velocity)3
  • (Velocity)4
Q9 | The surface tension of mercury at normal temperature compared to that of water is
  • More
  • Less
  • Same
  • More or less depending on size of glass tube
Q10 | An air vessel is provided at the summit in a siphon to
  • Avoid interruption in the flow
  • Increase discharge
  • Increase velocity
  • Maintain pressure difference
Q11 | The unit of viscosity is
  • Metres² per sec
  • kg-sec/metre
  • Newton-sec per metre²
  • Newton-sec per meter
Q12 | Select the correct statement
  • Weber's number is the ratio of inertia force to elastic force.
  • Weber's number is the ratio of gravity force to surface tension force.
  • Weber's number is the ratio of viscous force to pressure force.
  • Weber's number is the ratio of inertia force to surface tension force.
Q13 | Choose the wrong statement. Alcohol is used in manometer, because
  • Its vapour pressure is low
  • It provides suitable meniscus for the inclined tube
  • Its density is less
  • It provides longer length for a given pressure difference
Q14 | When a tank containing liquid moves with an acceleration in the horizontal direction, then the free surface of the liquid
  • Remains horizontal
  • Becomes curved
  • Falls on the front end
  • Falls on the back end
Q15 | A pressure of 25 m of head of water is equal to
  • 25 kN/ m²
  • 245 kN/ m²
  • 2500 kN/m²
  • 2.5 kN/ m²
Q16 | The hammer blow in pipes occurs when
  • There is excessive leakage in the pipe
  • The pipe bursts under high pressure of fluid
  • The flow of fluid through the pipe is suddenly brought to rest by closing of the valve
  • The flow of fluid through the pipe is gradually brought to rest by closing of the valve
Q17 | The resultant upward pressure of the fluid on an immersed body is called
  • Up-thrust
  • Buoyancy
  • Center of pressure
  • All the above are correct
Q18 | When the water level on the downstream side of a weir is above the top surface of a weir, the weir is known as
  • Narrow-crested weir
  • Broad-crested weir
  • Ogee weir
  • Submerged weir
Q19 | If the surface of liquid is convex, men
  • Cohesion pressure is negligible
  • Cohesion pressure is decreased
  • Cohesion pressure is increased
  • There is no cohesion pressure
Q20 | The atmospheric pressure with rise in altitude decreases
  • Linearly
  • First slowly and then steeply
  • First steeply and then gradually
  • Unpredictable
Q21 | Dynamic viscosity of most of the gases with rise in temperature
  • Increases
  • Decreases
  • Remain unaffected
  • Unpredictable
Q22 | According to Bernoulli's equation
  • Z + p/w + v²/2g = constant
  • Z + p/w - v²/2g = constant
  • Z - p/w + v²/2g = constant
  • Z - p/w - v²/2g = constant
Q23 | Newton's law of viscosity is a relationship between
  • Pressure, velocity and temperature
  • Shear stress and rate of shear strain
  • Shear stress and velocity
  • Rate of shear strain and temperature
Q24 | Differential manometer is used to measure
  • Pressure in pipes, channels etc.
  • Atmospheric pressure
  • Very low pressure
  • Difference of pressure between two points
Q25 | Non uniform flow occurs when
  • The direction and magnitude of the velocity at all points are identical
  • The velocity of successive fluid particles, at any point, is the same at successive periods of time
  • Velocity, depth, pressure, etc. change from point to point in the fluid flow.
  • The fluid particles move in plane or parallel planes and the streamline patterns are identical in each plane